| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not been seen [prep] [noun] | 20 |
|
| 2 | not [been] seen [prep] [noun] | 17 |
|
| 3 | not [been] seen [prep] [noun prp] | 11 |
|
| 4 | not [been] seen in [noun] | 9 |
|
| 5 | not [been] seen since [noun] | 5 |
|
| 6 | not [been] seen [prep] [noun pl] | 5 |
|
